Purse-string versus linear closure of the skin wound following stoma reversal: A meta-analysis with RCT and systematic review

Background: Linear closure (LC) following stoma reversal is associated with a high risk of surgical site infection (SSI). Purse-string closure and LC were both positive for the closure of the skin wound following stoma reversal, and it was not yet possible to distinguish which one was more beneficial to the patient’s prognosis. Methods: We conducted a search in Embase, PubMed, Web of Science, and Cochrane Library and conducted a randomized controlled experiment from the inception of each database to July 2024. Among them, the SSI within 30 days, operation time, hospitalization time, incisional hernia, and wound healing time were all outcome indicators. Results: Eleven studies were included in this meta-analysis (506 patients in the purse-string closure group and 489 patients in the LC group). The pooled data showed that the SSI rate was significantly lower in the purse-string closure group than in the LC group (odds ratio, 0.15; 95% confidence interval, 0.09–0.24; P < .00001; I2 = 0%). The differences in operative time, hospitalization time, incision hernia, and wound healing time were not statistically significant. Conclusion: Overall, purse-string closure had a significantly lower SSI rate following stoma reversal than LC.


Introduction
Temporary stoma is generally performed in colorectal surgery to decrease the risk of anastomotic leakage and reoperation. [1]urgical site infection (SSI) is one of the most common complications associated with surgery. [2]Linear closure (LC) is used in stoma reversal surgery, and SSI rates have been reported to be as high as 41%. [3]The increased incidence of incisional hernia, delayed wound healing, decreased patient satisfaction, prolonged hospitalization time, and increased hospitalization expenses may be caused by SSI. [4]n 1997, Banerjee [5] reported a surgical method called pursestring closure (PSC) that decreased scarring, which helped reduce the incidence of SSI.The fascial closure procedure leaves a gap of approximately 5 mm after the skin is stitched.By draining the residual hematoma or exudates, the incision healed secondarily, thereby reducing the risk of SSI.We reviewed 11 randomized controlled trials (RCTs) to compare the SSI rate, operation time, hospitalization time, wound healing time, and incidence of incisional hernias.

Search strategy
A comprehensive search of all published RCTs was performed to compare the surgical outcomes of PSC versus LC following stoma reversal surgery.
We searched Embase, PubMed, China National Knowledge Infrastructure, Web of Science, Technology Journal Database, and Wanfang Database from the inception of each database to July 2024.The search terms included "purse string," "linear closure," and "colostomy/ileostomy reversal."A gray literature search of the US National Institutes of Health trial register (clinicaltrials.gov)was also performed.The references included in the articles were checked and analyzed further.In any case, a third reviewer discussed or negotiated to resolve any differences between the 2 authors.The current research program was registered in the Prospective Registry of International Systematic Evaluation (ID: CRD42022311080).Our study followed the Preferred Items for Reporting of Systematic Reviews and Meta-Analyses [6] and Meta-Analysis of Observational Studies in Epidemiology guidelines. [7]

Selection criteria and explanations
RCTs comparing PSC and LC for wound closure following stoma reversal must focus on one of the outcomes, including SSI, incisional hernia, operative time, hospital stay, and wound healing time.
According to the US Centers for Disease Control and Prevention guidelines, SSI is a superficial or deep incisional infection within 30 days after surgery. [8]

Data extraction and quality assessment
Two reviewers independently extracted the outcomes including the first author, country, year of publication, stoma type, antibiotic use, follow-up, and outcome data (SSI, incision hernia, operative time, hospital stay, and wound healing time).In the event of disagreement, the final decision was made through discussion or consultation with a third reviewer.
Two authors independently assessed the risk of bias. [9]When there was disagreement between the 2 authors, a third author was consulted.The following 7 domains were estimated: random sequence generation, allocation concealment, blinding of participants and personnel, blinding of outcome assessment, incomplete outcome data, selective reporting, and other biases.

Statistical analyses
The meta-analysis was conducted using the Nordic Cochrane Center Review Manager (version 5.4).Incisional hernia and SSI were binary variables, and odds ratios (ORs) with 95% confidence intervals (CIs) were used.For continuous variables, operating time, hospital stay, incisional hernia, and wound healing time were calculated as mean differences (MDs) with a 95% CI.For the heterogeneity tests, we used the χ 2 and I 2 inconsistency statistics.The values of the statistics above 50% were considered significant, and the possible reasons were explored in greater detail.Fixed effect models were adopted because of low heterogeneity among the studies.If the heterogeneity among the studies was high, the reasons were further analyzed, and a   [18] Ireland, 2017 34/27 Ileostomy 1. random-effects model was Publication bias was evaluated using funnel plots.

Study characteristics
From the initial search of databases and other sources, 326 studies were identified.A flowchart was used to identify the eligible studies (Fig. 1).Eleven articles were selected, and 995 patients (506 patients in the PSC group and 489 patients in the LC group) were included.Detailed information regarding the basic characteristics of the study is presented in Table 1.An assessment of the bias is presented in Figure 2.

Operation time
Six studies with a total of 518 participants reported the operation time.The differences between the 2 groups were not statistically significant (MD, −2.80; 95% CI, −8.40 to 2.80; P = .33).Owing to the high heterogeneity (I 2 = 58%), we used a random-effects model to validate the results (Fig. 5).

Wound healing time
The healing time of the wound was reported in 3 studies with 235 participants.There was no statistically significant difference (MD, −2.57; 95% CI, −16.27 to 11.13; P = .71;I 2 = 93%).We used the random-effects methodology (Fig. 7) to validate the results because of the statistical significance of the heterogeneity (P < .00001).

Publication bias
The 11 studies included in this meta-analysis are symmetrically distributed around the vertical dotted line that indicates the overall effect estimate.Consequently, the funnel plot (Fig. 8)   does not reveal any evidence of publication bias or other forms of reporting bias.

Discussion
We included 11 recently published RCTs that compared the surgical outcomes of PSC and LC approaches following stoma reversal surgery.This meta-analysis indicated that the PSC technique was associated with a significantly lower SSI rate than the LC technique without increasing operation time and hospital stays.
[23] The meta-analysis by Li et al [24] showed that PSC is the best skin closure technique following stoma reversal in terms of SSI rat compared with wound closure with a drain, secondary closure, loose primary closure, and delayed primary closure.The results are consistent with our analysis.Analysis of data from 11 RCTs including a total of 995 participants showed that PSC likely reduces the risk of SSI in patients undergoing stoma reversal.Stoma reversal is associated with a high risk of SSI owing to the presence of microorganisms on the skin around the stoma site and possible contamination with   the intestinal during bowel manipulation. [25,26]Because superficial skin heals more bacterial contamination is not easily discharged following linear suture treatment, leading to local abscess formation. [27]In the purse-string procedure after suturing the skin, a skin defect (0.5-1 cm) is left or centrally opened.It prevents the accumulation of exudate and maintains the persistent drainage of fluid at an easily contaminated stoma reversal wound. [28]The wound healed secondarily with small granulation tissue and achieved a better cosmetic outcome.Meanwhile, the heterogeneity among the studies was low.Therefore, we believe that PSC offers distinct advantages for stoma reversal in real practice.
Our study did not reveal a statistically significant difference in the incidence of incisional hernia, length of hospital stays, or wound healing time between the 2 surgical procedures.For most patients, the SSI was superficial after stoma reversal and did not increase the damage to the strength of the abdominal wall structure.That won't increase the incidence of incisional hernia.This may explain why the incidence of incisional hernia is statistically equivalent between the 2 groups.
Due to the heterogeneity among the available studies, [27,29] more RCTs with a large sample size, multicenter design, and long follow-up are needed.

Conclusion
In conclusion, our meta-analysis showed that skin closure following stoma reversal using the PSC technique was more advantageous than the LC technique.

Figure 1 .
Figure 1.Flowchart of the search strategy.

Figure 2 .
Figure 2. Summary of risk of bias assessment.

Figure 5 .
Figure 5. Forest plot of operative time.CI = confidence interval, SD = standard deviation, df = degrees of freedom, IV = Iterative Moment Method.

Figure 6 .
Figure 6.Forest plot of hospital stay.CI = confidence interval, SD = standard deviation, df = degrees of freedom, IV = Iterative Moment Method.

Figure 7 .
Figure 7. Forest plot of wound healing time.CI = confidence interval, SD = standard deviation, df = degrees of freedom, IV = Iterative Moment Method.

Table 1
Characteristics of the studies included in the meta-analysis.